A 20-year-old was found suffering "multiple stab wounds" at a house in Thornton Heath.
Police and paramedics were called to an address in Langdale Road, Thornton Heath at 3.50pm yesterday.
The victim was taken to a south London trauma centre, where his condition was described a stable and not life-threatening.
No arrests have been made and police are continuing to investigate.
It was the second stabbing in Croydon yesterday afternoon, after a 21-year-old was knifed in New Addington less than two hours earlier.
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